636650140464 has 160 divisors (see below), whose sum is σ = 1983490826240. Its totient is φ = 194349673728.

The previous prime is 636650140459. The next prime is 636650140507. The reversal of 636650140464 is 464041056636.

636650140464 is a `hidden beast` number, since 6 + 3 + 66 + 501 + 40 + 46 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266919 + ... + 1159545.

It is an arithmetic number, because the mean of its divisors is an integer number (12396817664).

Almost surely, 2^636650140464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636650140464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991745413120).

636650140464 is an abundant number, since it is smaller than the sum of its proper divisors (1346840685776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636650140464 is a wasteful number, since it uses less digits than its factorization.

636650140464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892784 (or 892772 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 636650140464 in words is "six hundred thirty-six billion, six hundred fifty million, one hundred forty thousand, four hundred sixty-four".